The global green bond market is growing with demand from investors outpacing the supply of investments. The market had $895 billion in total debt outstanding this year and the transport sector was the largest share, accounting for 61% of the total. The green bond proceeds were used mostly for rail and transit projects with a smaller amount electric car production issued by companies such as Tesla. While the U.S. P3 market is beginning to see more transit projects, the sector is dominated by toll road projects, which are not suited for green bonds. A more practicable route for P3 projects to attract green, or sustainable, investors is to apply the ESG (environmental, social and governance) principles of sustainable investing.